to A as follow x R y iff |𝑥| = |𝑦| x S y iff x-y is even state explicity which ordered pairs are in RUS and R ∩ �
RUS {(-1,-1) ... (4,-4)}U{(-1,-1),(-1,-3),...,(4,-2),(4,-4)} and eliminate the duplicates. Now do the intersection in like wise
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